[Bug 3512] Implement font-stretch property

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--- Comment #44 from Zack Weinberg <zweinberg at mozilla.com>  2008-06-04 14:56:44 PDT ---
There are nine base font-stretches, just as there are nine base font-weights. 
Thus, how about encoding the ordered list in both cases as an ASCII string,
with this format: the first character is always a digit '1' ... '9', which is
mapped to a font-weight or font-stretch in the obvious fashion, and subsequent
characters are either '+' (meaning "bolder" or "wider") or '-' (meaning
"lighter" or "narrower").  This is easy to process and also conveniently
human-readable in debugging dumps.  Won't do for getComputedStyle, but we're
supposed to propagate gfx's actual choice of font back up for that anyway.  And
we already hang other strings off style structs, so it shouldn't be a memory
management headache.


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